Another item had been added to that constant and apparently purposeless series of small mysteries which had succeeded each other so rapidly.

His heart was, I knew, affected, and the constant anxiety in which he lived, however chimerical the cause of it might be, was evidently having a serious effect upon his health.

The idea of some ghastly presence constantly haunted him, and on more than one occasion he has asked me whether I had on my medical journeys at night ever seen any strange creature or heard the baying of a hound.

If matters came to a crisis I should endeavour to be present in person; but you can understand that, with my extensive consulting practice and with the constant appeals which reach me from many quarters, it is impossible for me to be absent from London for an indefinite time.

And a new sound mingled with it, a deep, muttered rumble, musical and yet menacing, rising and falling like the low, constant murmur of the sea.

There are no more uses of "constant" in the book.

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The history of computers is a history of constant technological advancement.